I think the reason people stopped covering their heads is b/c VII didn’t talk about it so people assumed that since the VII documents didn’t say Yay or Nay then it was automatically Nay. Therefore, people stopped covering.
Clearly, you are a devout and committed Catholic convert.
A little history of hat/headgear: Beginning at about the end of the 16th century, headgear for women shifted from veils and the like to hats. The wearing of hats (or whatever) as a matter of course in daily life faded out during - approximately - the 1960s (JFK didn’t wear a hat to his inauguration, and that is cited as one reason men stopped wearing them.)
As women became more active, working during WWII and afterward, headgear became more practical and wasn’t always worn. By the 1960s, the practice became sporadic, as hairstyles were more elaborate (kind of hard to wear most hats with those teased, sprayed, “bouffant” hairdos!) Though you would still certainly see some lovely hats (think Ascot, Princess Diana) most people had stopped wearing them, most of the time. You just were no longer considered “low class” or not quite dressed without your head covered.
As you stated, the headcovering issue was not mentioned in any of the many documents of Vatican II. It was in 1976 that the Congregation for the Doctrine of the Faith, in
Inter Insigniores, included that statement (previously referenced) about veiling have been a practice of the “customs of the period” and no longer having a “normative value”.
papalencyclicals.net/Paul06/p6interi.htm
Not long afterwards, the new Code of Canon Law (1983) abrogated the old (1917) code, and - significantly - did not include anything at all resembling Canon 1262, which had mandated not only that women cover their heads, but indicated that women should sit apart from men in Church! (You’ll find few people insisting that separation of the sexes in Church should still be the norm.)
So, though some try to insist that the Church has not actually expressed an opinion, I maintain that She has, indeed, both by inclusion (
Inter Insigniores) and omission (nothing in the new Code.)
So, cover your head when and if you choose, as no one should suggest you should not, but understand what the Church has - and has not - said on the subject.